Effect of 7-day Bismuth Quadruple Therapy versus 14-day Moxifloxacin Triple Therapy for Second-line Helicobacter pylori Eradication Therapy.

Background/aims: Both bismuth-containing quadruple therapy and moxifloxacin-containing triple therapy have been suggested as second-line eradication therapy for Helicobacter pylori ( H. pylori ) infection. We aimed to evaluate the efficacy of 14-day moxifloxacin-containing triple therapy (14-EAM) in second-line H. pylori eradication in comparison to 7-day bismuth-containing quadruple therapy (7-RBMT).
Methods: From January 2011 to December 2015, a total of 569 patients who failed to respond to first-line triple therapy and who subsequently received second-line 7-RBMT or 14-EAM were retrospectively enrolled. The eradication rates were identified using per-protocol (PP) analysis. H. pylori eradication was confirmed by a ¹³C-urea breath test (UBiT-IR300 ^® ; Otsuka Electronics, Co., Ltd., Osaka, Japan) or a rapid urease test (CLOtest ^® Delta West, Bentley, Australia) at least 4 weeks after completion of eradication therapy.
Results: A total of 487 and 82 patients received 7-RBMT and 14-EAM, respectively. PP eradication rates were 93.6% (366/391; 95% CI, 91.0-95.9%) with 7-RBMT and 73.8% (48/65; 95% CI, 63.1-84.6%) with14-EAM (p<0.001). Therefore, the eradication rates with 7-RBMT were significantly higher than with 14-EAM according to the PP analysis. The adverse event rate was 17.1% (67/391) with 7-RBMT and 7.7% (5/65) with 14-EAM (p=0.065). In terms of risk factors, multivariate analysis revealed that 14-EAM (OR, 5.47; 95% CI, 2.74-10.93) was related to H. pylori eradication failure.
Conclusions: 7-RBMT may be an effective second-line therapy in patients who failed to respond to first-line triple therapy in Korea, where there is a high prevalence of H. pylori infection.